OG Here. One of the few people on here with a legal background and a level head. Please let me explain.
Been at this stuff for recreation & YouTube since 2011. I made a video explaining the full legal parameters, scope, history, and significance of all of this. Here is the link if you are interested:https://www.youtube.com/watch?v=A_ffiIp218k
The TL DR version of it is the following. CALM DOWN. Everyone needs to calm down. This doesn't mean you can't play GTA 5, use GTA 5 mods, or make GTA videos any more. All it means in the most literal sense is that if you update to the Gunrunners DLC, you can't use vehicle, texture, sound mods. You can back up your game and keep using OpenIV and all the mods you want, until something is changed. That's all it means. I'm sure there will be some bootleg Chinese "OpenIV" that will come out. Rockstar's statement on this and their previous behavior would indicate they are not actively opposed to modding. Chill out.
Here is the problem. There is no such thing as "GTA Mod Laws." There is copyright law, US Code, case law, case precedents, DMCA, etc. The internet and the digital realm is poorly regulated and even more poorly litigated. The result is that large corporations that can easily pay tweedy $800+/hr Manhattan attorneys to twist the law however is convenient to shake people down, can and will. People can't afford to fight back so it works, right or wrong.
While I am hopelessly biased toward the video creators, the modders, etc., I must admit I feel OpenIV is in the wrong. The whole thing exists in a massive grey area as it is, and I know from experience that OpenIV and its creators have always pushed the envelope when it comes to reverse engineering Rockstar's creations. Whether it was the Liberty City to GTA 5 mod (borderline legally indefensible) or simply how far OpenIV's creators got into Rockstar's sock drawer, this was bound to happen. OpenIV's creator(s) acknowledged this as well as the fact they felt it would ultimately happen.
Take Two Interactive's bread and butter is GTA Online, Shark Cards, and the proliferation of freemium micro-transaction sausage making. The integrity of GTA Online has always been paramount to Rockstar Games, and OpenIV's continuous reverse engineering of the game's systems, as well as other transgressions which at this point seem to be known only to Take Two's counsel and OpenIV's creator, crossed the line for Take Two.
REMEMBER: OpenIV has been around for about 10 years, and it has been around for 2 years for GTA 5 alone. Ask yourself-----why now?
Why all of a sudden?
OpenIV went too far into Rockstar's proprietary sock drawer. That's why.
All we need is a mod that lets you replace a Sultan with a Ferrari; a "SparkIV" for GTA 5.
Then all will be well. Just calm down.